<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>二级联动</title>
</head>
<body>
<div>
    <label>城市</label> <select id="sltCity"></select>
    <label>区</label><select id="sltArea"></select>
</div>
</body>
<script src="mock/cities.js"></script>

<script src="js/select2.js"></script>

</html>